SGE's signings were probably about 50:50 though in terms of good and the bad, he did make a bloody lot of them though, which can never be helpful to players already at the club.
He did make some excellent signings like Nugent, Kasper, Danns, Naughton, Yakubu, Davies etc, but he certainly made more than a couple of off signings: Bednar, Kirkland, van Aanholt, Bruma, Uchechi, Ricardo, Mills, Banton, Johnson, Ball, Pantsil and arguably Peltier.
Regardless of the manager situation though, I think people are just frustrated because when you look at it because in the space of 12 months (or whatever) we spent ~£11mil on transfer fees on Waghorn, Mills and Beckford and that was only on 3 players and really for £11mil worth of transfer fees you should be building an entire title challenging squad at this level, not just all that on 3 players, 2 of whom haven't performed at all and the other has been inconsistent.
Regardless of who the manager is or was or has been, with the money we have spent over the past 18 months or so we should have built a side which should be at least in the top 2, let alone the top 6.